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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d48c3b08c758a6e00b2fb7b5dcd908b5f9eb92d14aff60ce1b5e1bf6a56bfc' 
  AND token = 'ubPciPOBeRLZk7CWnAf+n6cF1bFdZfODN0UsnVW3E6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}